import java.util.Scanner;

public class program12 {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        System.out.print("Enter speed and acceleration: ");
        double v = in.nextDouble();
        double a = in.nextDouble();
        double len = v * v / (2 * a);
        System.out.printf("The minimum runway length for this airplane is %.3f%n", len);
    }
}